gb_proxy_ctrl: use mcc-mnc-lac-rac notation instead mcc,mnc,lac,rac

The notation for the RAI used in the log is not compliant to the spec.

Change-Id: I6c8c3f3c017918fe847bfbcc153a12cf5f408bdb
Related: OS#4894
diff --git a/src/gb_proxy_ctrl.c b/src/gb_proxy_ctrl.c
index 794afd7..10d3727 100644
--- a/src/gb_proxy_ctrl.c
+++ b/src/gb_proxy_ctrl.c
@@ -94,7 +94,7 @@
 			struct gprs_ra_id raid;
 			gsm48_parse_ra(&raid, bvc->ra);
 
-			cmd->reply = talloc_asprintf_append(cmd->reply, "%u,%u,%u,%u,%u,%u,%s\n",
+			cmd->reply = talloc_asprintf_append(cmd->reply, "%u,%u,%u-%u-%u-%u,%s\n",
 					nse_peer->nsei, bvc->bvci,
 					raid.mcc, raid.mnc,
 					raid.lac, raid.rac,